, protect and defend the constitution of the united states. >> so help you god? >> so help me god. >> congratulations, mr. president. >> reporter: a hug from michelle. malia, 14, and sasha, 11, who joked, you didn't mess up. neither did the chief justice, who used notes after his famous flub in 2009. >> thank you, everybody. >> reporter: vice president biden was sworn in by justice sonia sotomayor. tomorrow's ceremonial swearing in is at the capitol. stand-ins helping set camera angles today. pennsylvania avenue is set for the inaugural parade, delayed like the capitol ceremony because they're never held on a sunday. police from around the nation will bolster security, grass protectors are down on the mall. the weather's mild. 800,000 people expected tomorrow. some saw the president today. when the obamas attended church. >> he started leaning over to us and we saw him. we were so excited to see him. >> reporter: the commander in chief laid a wreath at the tomb of the unknowns, a reminder of his burden, and of our two centuries of democracy. the inauguration is n